fs/squashfs: enable LZ4 compression support

The structure is identical to the existing compressor implementations,
trivially adding lz4 decompression to sqfs_decompress.

The changes were tested using a sandbox build. An LZ4 compressed
squashfs image was bound as a host block device.

Signed-off-by: David Oberhollenzer <goliath@infraroot.at>
Reviewed-by: Joao Marcos Costa <jmcosta944@gmail.com>
1 file changed